I highly doubt UAL will go through another merger.

I see the 25 used A319s coming faster than original planned an order for 50 A321 Neos and
An order for 100-125 CS 100 and 300 series , cheap deal by the Canadians

And a few more 777-300s since they are cheap for now

Close to 985 or so total frames by 2020 with close to 250 WBs total

375... 737s
250 A319, 320,321,350s
51 767s
62 757s
10 747
50 787s
85 777s
100 C series Canadian